Adapter.kt

/**
 * ListAdapter is a superclass of RecyclerView.Adapter. 
 * Check the d.android.com for more.
 */
class JobsAdapter : ListAdapter<JobListItem, JobViewHolder>() {

}

// items of 2 types 
sealed class JobListItem {

    object Header : JobListItem()

    data class JobItem(val payload: Payload) : JobListItem()

}

// a ViewHolder per item
sealed class JobViewHolder(...) : RecyclerView.ViewHolder(...) {

    class HeaderViewHolder(...) : JobViewHolder(..)

    class JobViewHolder(...) : JobViewHolder(..)
}